Electric heater with electric heating coating as core heating body

Abstract

The utility model provides an electric heater using an electric heating coating as a core heating body, comprising a substrate, an insulation heat conduction layer, an electric heating coating, an electrode slice and a protection layer, one side of the substrate is covered with the insulation heat conduction layer, the electric heating coating is laid on the insulation heat conduction layer, the insulation heat conduction layer is arranged between the substrate and the electric heating coating, and the electrode slice is arranged on the insulation heat conduction layer. The electric heating coating is arranged on the substrate, the two electrode plates are respectively attached to two end parts of the electric heating coating, the electrode plates are connected with a power line, and the protective layer covers the electric heating coating so as to isolate the electric heating coating from being in contact with the air, and is characterized in that the substrate is made of a metal or alloy material, and the grounding lead is directly and electrically connected to the substrate; and the melting point of the metal material or the alloy material is greater than 800 DEG C. The substrate is not broken after being impacted at a high temperature, meets the requirements of a safety test, is high in heat transfer efficiency, does not consume power and is environment-friendly; the structure is simple, the production process is simple, and the cost is low.

Description

TECHNICAL FIELD

[0001] The utility model relates to an electric heater with an electric heating coating as a core heating element. BACKGROUND

[0002] The graphene coating is widely used in electric kettles, electric hot plates and other heating appliances due to its high heat conversion rate after being electrified. However, as a heating component, the graphene coating will oxidize under high temperature conditions, resulting in a decrease in the heating power and temperature of the coating, and a rapid attenuation of the product life. Its structure is shown in Figure 1 、 Figure 2 、 Figure 3 and includes a substrate, an electric heating coating, an electrode sheet and a power line.

[0003] The utility model patent with the patent number CN202122141232.7 basically solves the above technical problems, but the current electric heater using the heating of the coating after being electrified still has the following problems: 1) the substrate attached with the electric heating coating (such as graphene coating) has impurities, which will generate static electricity on the substrate when the coating is heated after being electrified. In addition, in order to meet the safety requirements, the electric heater usually needs to be tested under high voltage. When the high voltage test is performed or the substrate is damaged, there is a risk of electric leakage, which results in that the product does not meet the safety standards and is difficult to pass the certification; 2) the grounding lead of the current electric heater product is connected to the shell instead of being directly connected to the substrate, so it cannot quickly guide the static electricity or electric leakage on the substrate to the ground, which does not meet the product safety requirements.

[0004] In view of the above technical problems, the applicant applied for a utility model patent for an electric heater with the application number 2024223606759 and the patent name on September 26, 2024. However, after continuous experiments and feedback from customers, the technical solution still has the following deficiencies: first, the substrate is made of non-metallic materials, such as ceramic, silicon carbide, quartz glass, enamel, zircon sand, microcrystalline glass, carbon crystal or carbon fiber. During the operation of the electric heater, the temperature reaches a high temperature of 400-800 degrees Celsius. The substrate is easy to crack under the impact of high temperature, which does not meet the requirements of safety tests. Second, the electric heating coating only covers the central part of the substrate, cannot be evenly distributed, has low thermal efficiency and consumes a lot of electricity, which is not environmentally friendly. Third, the substrate is made of non-metallic materials, which has low heat transfer efficiency and consumes a lot of electricity, which is not environmentally friendly. Fourth, the substrate is made of non-metallic materials, which generates static electricity. The grounding lead and related structures need to be installed to guide the static electricity to the ground. The structure is complex, the production process is complex, and the cost is high. SUMMARY

[0005] The utility model discloses a kind of electric heaters with electrothermal coating as core heating body, solve the electric heater with electrothermal coating as core heating body in prior art, substrate is made of non-metal material, electric heater in working process, temperature reaches 400-800 degrees Celsius high temperature, substrate is under high temperature, it is easy to break after impact, not meet the requirement of safety regulation test, heat transfer efficiency is low, power consumption is not environmental protection;Complex structure, complex production process, resulting in the technical problem of cost is higher.

[0006] The utility model is realized through the following technical schemes:

[0007] A kind of electric heater with electrothermal coating as core heating body, including substrate, insulating heat conducting layer, electric heating coating, electrode sheet and protective layer, one side of substrate covers insulating heat conducting layer, electric heating coating is laid on insulating heat conducting layer, insulating heat conducting layer is between substrate and electric heating coating, two electrode sheets are respectively attached in the two end portions of the electric heating coating, the electrode sheet is connected power cord, protective layer is covered on electric heating coating to isolate electric heating coating and air contact, characterized in that: substrate is made of metal or alloy material, ground lead is directly electrically connected on substrate, the melting point of the metal material or alloy material is greater than 800 degrees Celsius.

[0008] Preferably, substrate is made of stainless steel, or titanium, or magnesium, or nickel-based superalloy, or iron-based superalloy, or cobalt-based superalloy material.

[0009] Preferably, electric heating coating is in the form of printed circuit and uniformly laid on insulating heat conducting layer, and uniformly covers the substrate area.

[0010] Preferably, electric heating coating is graphene heating coating.

[0011] Preferably, substrate is circular, and 3 mounting feet are protruded on the side surface of substrate.

[0012] Preferably, one of the 3 mounting feet of substrate is directly connected with ground lead, and the other two mounting feet are covered with insulating heat conducting layer, and two ends of electric heating coating are extended to the two mounting feet and connected with electrode sheet.

[0013] The utility model has the beneficial effects compared with prior art:

[0014] Effect 1: substrate is made of metal or alloy material, ground lead is directly electrically connected on substrate, the melting point of the metal material or alloy material is greater than 800 degrees Celsius, not easy to break in high-temperature anti-collision test, meet the requirement of safety regulation test;In addition, ground lead is directly electrically connected on substrate, which can simplify structure, simplify production process and reduce manufacturing cost.

[0015] Effect 2: The substrate is made of metal or alloy material, the heat conduction performance of which is superior, and the energy conversion is high, so the power consumption is small, and the energy saving and environmental protection are achieved. The substrate is made of metal or alloy material, and does not need to be electroplated, so the production process is simpler and more environmentally friendly.

[0016] Effect 3: The electric heating coating is uniformly laid on the insulating and heat-conducting layer in the form of a printed circuit, and uniformly covers the substrate area. The substrate is more uniform in heat conduction, the energy conversion is high, the power consumption is small, and the energy saving and environmental protection are achieved.

[0017] Effect 4: The substrate is circular, and three mounting feet are protruded on the side surface of the substrate. One of the three mounting feet of the substrate is directly connected with a ground lead, and the other two mounting feet are covered with an insulating and heat-conducting layer. The two ends of the electric heating coating are respectively extended to the two mounting feet and connected with electrode pieces. The installation and positioning are convenient, the layout is reasonable, and the production is convenient. BRIEF DESCRIPTION OF DRAWINGS

[0018] The above and other objects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings. In the drawings like reference numerals refer to like elements throughout. The drawings have not been drawn to scale with the intention to emphasize the functional principles of the present application.

[0019] Figure 1 is a perspective view of the present application;

[0020] Figure 2 is a sectional view of the structure of the present application;

[0021] Figure 3 is a plan view of the electric heating coating laid on the insulating and heat-conducting layer of the present application;

[0022] Figure 4 is a perspective view of the second embodiment of the present application. DETAILED DESCRIPTION

[0023] In order to facilitate the understanding of the present application, the present application will be described more fully below with reference to the related drawings.

[0024] It should be noted that when an element is considered to be "connected" to another element, it can be directly connected to the other element and integrated as a whole, or a middle element can exist at the same time. The terms "mounting", "one end", "the other end" and similar expressions used herein are only for the purpose of illustration.

[0025] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application. The use herein of the terms "including", "comprising", "having" and the like are meant to encompass the items listed thereafter as well as other items.

[0026] Referring to Figure 1 , Figure 2 and Figure 3 , the embodiment of the present application provides an electric heater with an electrothermal coating as a core heating body, comprising a substrate 10, an insulating and heat-conducting layer 40, an electrothermal coating 20, electrode sheets 30 and a protective layer 50. The substrate 10 is covered with the insulating and heat-conducting layer 40 on one side, the electrothermal coating 20 is laid on the insulating and heat-conducting layer 40, the insulating and heat-conducting layer 40 is between the substrate 10 and the electrothermal coating 20, two electrode sheets 30 are respectively attached to the two ends of the electrothermal coating 20, the electrode sheets 30 are connected with a power line 60, and the protective layer 50 covers the electrothermal coating 20 to isolate the electrothermal coating 20 from air. The feature is that the substrate 10 is made of metal or alloy material, a grounding lead 70 is directly connected with the substrate 10, and the melting point of the metal or alloy material is greater than 800 degrees Celsius. The insulating and heat-conducting layer 40 plays the role of insulation and heat conduction, the heat generated by the electrothermal coating 20 after being electrified is transmitted to the substrate 10 through the insulating and heat-conducting layer 40, and the insulating and heat-conducting layer 40 also plays the role of isolating the substrate 10 and the electrothermal coating 20 to prevent electric leakage.

[0027] Preferably, the substrate 10 is made of stainless steel, titanium, magnesium, nickel-based superalloy, iron-based superalloy or cobalt-based superalloy material, which is easy to obtain, has a melting point of more than 1000 degrees Celsius, is resistant to high temperature, has high structural strength, and the electric heater reaches a high temperature of 400-800 degrees Celsius during operation. The substrate will not break after impact under high temperature, meeting the requirements of safety testing. The grounding lead 70 is directly connected with the substrate 10, which can simplify the structure, simplify the production process and reduce the manufacturing cost. The substrate 10 made of stainless steel does not need electroplating treatment, is environmentally friendly and has low manufacturing cost. The substrate 10 made of stainless steel, titanium or magnesium material has excellent heat conduction performance, high heat conversion efficiency and energy saving and environmental protection. Since the substrate 10 is made of metal or alloy material, it has good electrical conductivity, and static electricity on the substrate 10 is directly led to the ground through the grounding lead 70.

[0028] Preferably, the electrothermal coating 20 is uniformly laid on the insulating and heat-conducting layer 40 in the form of a printed circuit and uniformly covers the area of the substrate 10, uniformly generates heat, has high heat conversion efficiency and is energy saving and environmentally friendly.

[0029] Preferably, the electric heating coating 20 is a graphene heating coating, which has high heat conversion efficiency and is energy-saving and environment-friendly.

[0030] Embodiment two:

[0031] This embodiment is an improvement based on embodiment one, and the change points are as follows Figure 4 As shown in the figure, preferably, the substrate 10 is circular, and three mounting feet 11 are spaced apart on the side of the substrate 10. Preferably, one of the three mounting feet 11 of the substrate 10 is directly electrically connected with the ground lead 70, and the other two mounting feet 11 are covered with the insulating and heat-conducting layer 40, and the two ends of the electric heating coating 20 respectively extend to the above-mentioned two mounting feet 11 and are connected with the electrode sheet 30. The mounting and positioning are convenient, the layout is reasonable, and the production is convenient.

[0032] The above embodiments only express the specific implementation manners of the utility model, and the description is more specific and detailed, but it cannot be understood as the limitation of the scope of the utility model patent. It should be pointed out that for ordinary skilled persons in the art, some modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent should be subject to the appended claims.

Claims

1. An electric heater with an electrothermal coating as a core heating body, comprising a substrate (10), an insulating and heat-conducting layer (40), an electrothermal coating (20), electrode pieces (30) and a protective layer (50), one side of the substrate (10) is covered with the insulating and heat-conducting layer (40), the electrothermal coating (20) is laid on the insulating and heat-conducting layer (40), the insulating and heat-conducting layer (40) is between the substrate (10) and the electrothermal coating (20), two electrode pieces (30) are respectively attached to the two ends of the electrothermal coating (20), the electrode pieces (30) are connected with power lines (60), and the protective layer (50) covers the electrothermal coating (20) to isolate the electrothermal coating (20) from air, characterized in that: The substrate (10) is made of metal or alloy material, the grounding lead (70) is directly electrically connected to the substrate (10), and the melting point of the metal or alloy material is greater than 800 DEG C.

2. The electric heater with the electric heating coating as the core heating body according to claim 1, characterized in that: The substrate (10) is made of stainless steel, titanium, magnesium, nickel-based superalloy, iron-based superalloy or cobalt-based superalloy material.

3. The electric heater according to claim 2, wherein: the electric heater is an electric heater for a vehicle. The electric heating coating (20) is uniformly laid on the insulating heat-conducting layer (40) in the form of a printed circuit and uniformly covers the area of the substrate (10).

4. An electric heater having an electrically heatable coating as a core heating element according to any one of claims 1 to 3, characterized in that: The electric heating coating (20) is a graphene heating coating.

5. An electric heater having an electrically heatable coating as a core heating element according to any one of claims 1 to 3, characterized in that: The substrate (10) is circular, and three mounting feet (11) are spaced apart and protrude from the side of the substrate (10).

6. An electric heater having an electrically heatable coating as a core heating element as claimed in claim 5, characterized in that: One of the three mounting feet (11) protruding from the substrate (10) is directly electrically connected to the grounding lead (70), the other two mounting feet (11) are covered with the insulating heat-conducting layer (40), and the two ends of the electric heating coating (20) extend to the above-mentioned two mounting feet (11) and are connected to the electrode sheets (30).

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